ob_end_clean(): failed to delete buffer. No buffer to delete

Around line 629 in contact-form-7-to-database-extension/CF7DBPlugin.php There is a simple ob_end_clean() call. But that function will throw a notice “ob_end_clean(): failed to delete buffer. No buffer to delete”

This can be avoided by using the following code instead:

if (ob_get_length() > 0) { ob_end_clean(); }

Please add this code to the core plugin.